diff --git a/include/xo/unit/dim_iostream.hpp b/include/xo/unit/dim_iostream.hpp
index c420bca1..0621578b 100644
--- a/include/xo/unit/dim_iostream.hpp
+++ b/include/xo/unit/dim_iostream.hpp
@@ -5,7 +5,7 @@
 
 #pragma once
 
-#include "dim_util.hpp"
+#include "dimension.hpp"
 #include <iostream>
 
 namespace xo {
diff --git a/include/xo/unit/dim_util2.hpp b/include/xo/unit/dim_util2.hpp
index 709056cd..40133397 100644
--- a/include/xo/unit/dim_util2.hpp
+++ b/include/xo/unit/dim_util2.hpp
@@ -5,7 +5,7 @@
 
 #pragma once
 
-#include "dim_util.hpp"
+#include "dimension.hpp"
 #include "xo/flatstring/flatstring.hpp"
 
 namespace xo {
diff --git a/include/xo/unit/dim_util.hpp b/include/xo/unit/dimension.hpp
similarity index 97%
rename from include/xo/unit/dim_util.hpp
rename to include/xo/unit/dimension.hpp
index b00e2126..a4fe8746 100644
--- a/include/xo/unit/dim_util.hpp
+++ b/include/xo/unit/dimension.hpp
@@ -1,4 +1,4 @@
-/* @file dim_util.hpp */
+/* @file dimension.hpp */
 
 #pragma once
 
@@ -77,4 +77,4 @@ namespace xo {
     } /*namespace qty*/
 } /*namespace xo*/
 
-/* end dim_util.hpp */
+/* end dimension.hpp */